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                    updateFunctionalComponent
            
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                    updateClassComponent
            
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                    updateHostRoot
            
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                    updateHostComponent
            
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                    updateHostText
            
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                    updateSuspenseComponent
            
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                    updatePortalComponent
            
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                    updateForwardRef
            
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                    updateFragment
            
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                    updateMode
            
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                    updateProfiler
            
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                    updateContextProvider
            
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                    updateContextConsumer
            
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                    commit 阶段
            
                </span>
            

            
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        <li class="chapter " data-level="1.5.1" data-path="../commit-root.html">
            
                <a href="../commit-root.html">
            
                    
                    commitRoot
            
                </a>
            

            
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        <li class="chapter " data-level="1.5.2" data-path="../invokeGuardedCallback.html">
            
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                    invokeGuardedCallback
            
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        <li class="chapter " data-level="1.5.3" data-path="../commitBeforeMutationLifecycles.html">
            
                <a href="../commitBeforeMutationLifecycles.html">
            
                    
                    commitBeforeMutationLifecycles
            
                </a>
            

            
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        <li class="chapter " data-level="1.5.4" data-path="../commit-all-host-effects.html">
            
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                    commitAllHostEffects
            
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        <li class="chapter " data-level="1.5.4.1" data-path="CommitPlacement.html">
            
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                    commitPlacement
            
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                    commitWork
            
                </a>
            

            
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        <li class="chapter active" data-level="1.5.4.3" data-path="CommitDeletion.html">
            
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                    commitDeletion
            
                </a>
            

            
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                    commitAllLifecycle
            
                </a>
            

            
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                    功能
            
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                                <div class="api-method"><div class="api-method-definition"><h1 id="commitdeletion">commitDeletion</h1><p><code>unmountHostComponents</code>&#x662F;&#x4E00;&#x4E2A;&#x5927;&#x7684;&#x904D;&#x5386;</p><p>&#x6CE8;&#x610F;&#x8FD9;&#x91CC;&#x53EA;&#x4F1A;&#x5BF9;&#x975E;<code>HostComponent</code>&#x7684;&#x8282;&#x70B9;&#x67E5;&#x627E;&#x5B50;&#x6811;&#xFF1A;</p><pre><code class="lang-js">} <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (node.tag === HostPortal) {
  currentParent = node.stateNode.containerInfo;
  currentParentIsContainer = <span class="hljs-literal">true</span>;
  <span class="hljs-comment">// Visit children because portals might contain host components.</span>
  <span class="hljs-keyword">if</span> (node.child !== <span class="hljs-literal">null</span>) {
    node.child.return = node;
    node = node.child;
    <span class="hljs-keyword">continue</span>;
  }
} <span class="hljs-keyword">else</span> {
  commitUnmount(node);
  <span class="hljs-comment">// Visit children because we may find more host components below.</span>
  <span class="hljs-keyword">if</span> (node.child !== <span class="hljs-literal">null</span>) {
    node.child.return = node;
    node = node.child;
    <span class="hljs-keyword">continue</span>;
  }
}</code></pre>
<p>&#x5BF9;&#x4E8E;<code>HostComponent</code>&#x53EA;&#x4F1A;&#x627E;&#x5144;&#x5F1F;&#x8282;&#x70B9;&#xFF0C;&#x800C;&#x4ED6;&#x7684;&#x904D;&#x5386;&#x653E;&#x5728;&#x4E86;<code>commitNestedUnmounts</code>&#x3002;&#x6CE8;&#x610F;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x9012;&#x5F52;&#x7684;&#x8FC7;&#x7A0B;&#xFF0C;&#x5728;<code>commitNestedUnmounts</code>&#x4F1A;&#x5BF9;&#x6BCF;&#x4E2A;&#x5B50;&#x8282;&#x70B9;&#x8C03;&#x7528;<code>commitUnmount</code>&#xFF0C;&#x5185;&#x90E8;&#x4F1A;&#x5BF9;<code>HostPortal</code>&#x7C7B;&#x578B;&#x9012;&#x5F52;&#x8C03;&#x7528;<code>unmountHostComponents</code>&#x3002;&#x540C;&#x6837;&#x7684;&#x5728;&#x8FD9;&#x91CC;&#x4E5F;&#x4F1A;&#x8C03;&#x7528;<code>commitUnmount</code>&#xFF0C;&#x6240;&#x4EE5;&#x4E5F;&#x4F1A;&#x9012;&#x5F52;&#x3002;</p><p>&#x8FD9;&#x91CC;&#x771F;&#x6B63;&#x9700;&#x8981;&#x4ECE; DOM &#x4E2D;&#x5220;&#x9664;&#x7684;&#x53EA;&#x6709;<code>HostComponent</code>&#xFF0C;&#x6240;&#x4EE5;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x7684;&#x4E3B;&#x903B;&#x8F91;&#x662F;&#x627E;&#x5230;<code>HostComponent</code>&#x5E76;&#x6839;&#x636E;&#x7236;&#x8282;&#x70B9;&#x7684;&#x7C7B;&#x578B;&#x6267;&#x884C;&#x4E0D;&#x540C;&#x7684;&#x5220;&#x9664;&#x64CD;&#x4F5C;&#x3002;</p></div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">commitDeletion</span>(<span class="hljs-params">current: Fiber</span>): <span class="hljs-title">void</span> </span>{
  <span class="hljs-keyword">if</span> (supportsMutation) {
    unmountHostComponents(current)
  } <span class="hljs-keyword">else</span> {
    commitNestedUnmounts(current)
  }
  detachFiber(current)
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">unmountHostComponents</span>(<span class="hljs-params">current</span>): <span class="hljs-title">void</span> </span>{
  <span class="hljs-keyword">let</span> node: Fiber = current

  <span class="hljs-keyword">let</span> currentParentIsValid = <span class="hljs-literal">false</span>

  <span class="hljs-comment">// Note: these two variables *must* always be updated together.</span>
  <span class="hljs-keyword">let</span> currentParent
  <span class="hljs-keyword">let</span> currentParentIsContainer

  <span class="hljs-keyword">while</span> (<span class="hljs-literal">true</span>) {
    <span class="hljs-keyword">if</span> (!currentParentIsValid) {
      <span class="hljs-keyword">let</span> parent = node.return
      findParent: <span class="hljs-keyword">while</span> (<span class="hljs-literal">true</span>) {
        invariant(
          parent !== <span class="hljs-literal">null</span>,
          <span class="hljs-string">&apos;Expected to find a host parent. This error is likely caused by &apos;</span> +
            <span class="hljs-string">&apos;a bug in React. Please file an issue.&apos;</span>,
        )
        <span class="hljs-keyword">switch</span> (parent.tag) {
          <span class="hljs-keyword">case</span> HostComponent:
            currentParent = parent.stateNode
            currentParentIsContainer = <span class="hljs-literal">false</span>
            <span class="hljs-keyword">break</span> findParent
          <span class="hljs-keyword">case</span> HostRoot:
            currentParent = parent.stateNode.containerInfo
            currentParentIsContainer = <span class="hljs-literal">true</span>
            <span class="hljs-keyword">break</span> findParent
          <span class="hljs-keyword">case</span> HostPortal:
            currentParent = parent.stateNode.containerInfo
            currentParentIsContainer = <span class="hljs-literal">true</span>
            <span class="hljs-keyword">break</span> findParent
        }
        parent = parent.return
      }
      currentParentIsValid = <span class="hljs-literal">true</span>
    }

    <span class="hljs-keyword">if</span> (node.tag === HostComponent || node.tag === HostText) {
      commitNestedUnmounts(node)
      <span class="hljs-keyword">if</span> (currentParentIsContainer) {
        removeChildFromContainer((currentParent: any), node.stateNode)
      } <span class="hljs-keyword">else</span> {
        removeChild((currentParent: any), node.stateNode)
      }
      <span class="hljs-comment">// Don&apos;t visit children because we already visited them.</span>
    } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (node.tag === HostPortal) {
      currentParent = node.stateNode.containerInfo
      currentParentIsContainer = <span class="hljs-literal">true</span>
      <span class="hljs-comment">// Visit children because portals might contain host components.</span>
      <span class="hljs-keyword">if</span> (node.child !== <span class="hljs-literal">null</span>) {
        node.child.return = node
        node = node.child
        <span class="hljs-keyword">continue</span>
      }
    } <span class="hljs-keyword">else</span> {
      commitUnmount(node)
      <span class="hljs-comment">// Visit children because we may find more host components below.</span>
      <span class="hljs-keyword">if</span> (node.child !== <span class="hljs-literal">null</span>) {
        node.child.return = node
        node = node.child
        <span class="hljs-keyword">continue</span>
      }
    }
    <span class="hljs-keyword">if</span> (node === current) {
      <span class="hljs-keyword">return</span>
    }
    <span class="hljs-keyword">while</span> (node.sibling === <span class="hljs-literal">null</span>) {
      <span class="hljs-keyword">if</span> (node.return === <span class="hljs-literal">null</span> || node.return === current) {
        <span class="hljs-keyword">return</span>
      }
      node = node.return
      <span class="hljs-keyword">if</span> (node.tag === HostPortal) {
        currentParentIsValid = <span class="hljs-literal">false</span>
      }
    }
    node.sibling.return = node.return
    node = node.sibling
  }
}</code></pre>
</div></div></div>



<div class="api-method"><div class="api-method-definition"><h1 id="commitnestedunmounts">commitNestedUnmounts</h1><p>&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x662F;&#x5728;&#x53D1;&#x73B0;&#x9700;&#x8981;&#x5220;&#x9664;&#x7684;&#x8282;&#x70B9;&#x662F;<code>HostComponent</code>&#x7684;&#x65F6;&#x5019;&#x8C03;&#x7528;&#x7684;</p><p>&#x904D;&#x5386;&#x5B50;&#x6811;&#xFF0C;&#x5BF9;&#x6BCF;&#x4E2A;&#x8282;&#x70B9;&#x8C03;&#x7528;<code>commitUnmount</code>&#xFF0C;&#x904D;&#x5386;&#x8FC7;&#x7A0B;&#x8DDF;<code>workLoop</code>&#x5DEE;&#x4E0D;&#x591A;&#xFF0C;&#x9075;&#x5FAA;&#x6DF1;&#x5EA6;&#x4F18;&#x5148;&#x904D;&#x5386;&#x89C4;&#x5219;</p><p>&#x5728;&#x8FD9;&#x4E2A;&#x904D;&#x5386;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x56E0;&#x4E3A;&#x5BF9;&#x4E8E;&#x6BCF;&#x4E2A;&#x8282;&#x70B9;&#x90FD;&#x4F1A;&#x8C03;&#x7528;<code>commitUnmount</code>&#xFF0C;&#x6240;&#x4EE5;&#x5982;&#x679C;&#x53D1;&#x73B0;&#x6709;<code>portal</code>&#x8282;&#x70B9;&#xFF0C;&#x5219;&#x4F1A;&#x9012;&#x5F52;&#x8C03;&#x7528;<code>unmountHostComponents</code></p></div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">commitNestedUnmounts</span>(<span class="hljs-params">root: Fiber</span>): <span class="hljs-title">void</span> </span>{
  <span class="hljs-keyword">let</span> node: Fiber = root
  <span class="hljs-keyword">while</span> (<span class="hljs-literal">true</span>) {
    commitUnmount(node)
    <span class="hljs-keyword">if</span> (node.child !== <span class="hljs-literal">null</span> &amp;&amp; (!supportsMutation || node.tag !== HostPortal)) {
      node.child.return = node
      node = node.child
      <span class="hljs-keyword">continue</span>
    }
    <span class="hljs-keyword">if</span> (node === root) {
      <span class="hljs-keyword">return</span>
    }
    <span class="hljs-keyword">while</span> (node.sibling === <span class="hljs-literal">null</span>) {
      <span class="hljs-keyword">if</span> (node.return === <span class="hljs-literal">null</span> || node.return === root) {
        <span class="hljs-keyword">return</span>
      }
      node = node.return
    }
    node.sibling.return = node.return
    node = node.sibling
  }
}</code></pre>
</div></div></div>



<div class="api-method"><div class="api-method-definition"><h1 id="commitunmount">commitUnmount</h1><p>&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x662F;&#x771F;&#x6B63;&#x7684;&#x5BF9;&#x6BCF;&#x4E2A;&#x8282;&#x70B9;&#x6267;&#x884C;&#x5220;&#x9664;&#x524D;&#x7684;&#x64CD;&#x4F5C;&#x7684;&#xFF0C;&#x5BF9;&#x4E8E;</p><h3 id="hostcomponent"><code>HostComponent</code></h3><p>&#x5982;&#x679C;&#x6709;<code>ref</code>&#x5219;&#x8981;&#x5378;&#x8F7D;</p><h3 id="classcomponent">ClassComponent</h3><p>&#x5982;&#x679C;&#x6709;<code>ref</code>&#x5219;&#x8981;&#x5378;&#x8F7D;</p><p>&#x5982;&#x679C;&#x6709;<code>componentWillUnmount</code>&#x751F;&#x547D;&#x5468;&#x671F;&#x65B9;&#x6CD5;&#xFF0C;&#x5219;&#x8C03;&#x7528;&#x4E4B;</p><h3 id="hostportal">HostPortal</h3><p>&#x7EE7;&#x7EED;&#x8C03;&#x7528;<code>unmountHostComponents</code></p></div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">commitUnmount</span>(<span class="hljs-params">current: Fiber</span>): <span class="hljs-title">void</span> </span>{
  onCommitUnmount(current)

  <span class="hljs-keyword">switch</span> (current.tag) {
    <span class="hljs-keyword">case</span> ClassComponent: {
      safelyDetachRef(current)
      <span class="hljs-keyword">const</span> instance = current.stateNode
      <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> instance.componentWillUnmount === <span class="hljs-string">&apos;function&apos;</span>) {
        safelyCallComponentWillUnmount(current, instance)
      }
      <span class="hljs-keyword">return</span>
    }
    <span class="hljs-keyword">case</span> HostComponent: {
      safelyDetachRef(current)
      <span class="hljs-keyword">return</span>
    }
    <span class="hljs-keyword">case</span> HostPortal: {
      <span class="hljs-keyword">if</span> (supportsMutation) {
        unmountHostComponents(current)
      } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (supportsPersistence) {
        emptyPortalContainer(current)
      }
      <span class="hljs-keyword">return</span>
    }
  }
}</code></pre>
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